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TR-MO-R1 2010 Problem 33

    m(ABC^)=90om(\widehat{ABC}) = 90^o ve ∣AC∣=10|AC| = 10 olan bir ABCABC üçgeninde [AC][AC] kenarının orta noktası DD olmak üzere, [AD][AD] ve [BD][BD] nin orta dikmeleri EE noktasında, [BD][BD] ve [CD][CD] nin orta dikmeleri de FF noktasinda kesişiyor. ∣EF∣=13|EF| = 13 ise, ∣AB∣|AB| aşağıdaki değerlerden hangisini alabilir?

    a) 2021320\sqrt{\dfrac{2}{13}} b) 1521315\sqrt{\dfrac{2}{13}} c) 1021310\sqrt{\dfrac{2}{13}} d) 52135\sqrt{\dfrac{2}{13}} e) Hiçbiri

    Official text Turkish Mathematical Olympiad, first round 2010 official paper, page 10. Quoted with source.

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